diff --git a/corsika/detail/modules/proposal/ProposalProcessBase.inl b/corsika/detail/modules/proposal/ProposalProcessBase.inl
index f1a5b419d2425e8fa977e4cae757ea5ce69f5670..2a72811ee9040cce07983c302f212f55d167f11c 100644
--- a/corsika/detail/modules/proposal/ProposalProcessBase.inl
+++ b/corsika/detail/modules/proposal/ProposalProcessBase.inl
@@ -105,8 +105,8 @@ namespace corsika::proposal {
     cross[particle_code](medium, emcut);
   }
 
-  inline size_t ProposalProcessBase::hash::operator()(
-      const calc_key_t& p) const noexcept {
+  inline size_t ProposalProcessBase::hash::operator()(const calc_key_t& p) const
+      noexcept {
     return p.first ^ std::hash<Code>{}(p.second);
   }